Ethylene glycol–preserved specimens have actually been first fixed in formaldehyde or formalin solutions. They are then washed and preserved in ethylene glycol, which is the same chemical in your car’s antifreeze. Ethylene glycol is another toxic chemical that our children are being exposed to during biology animal dissections. It can affect the central nervous system, heart and kidneys. Remember that besides the toxic ethylene glycol, these animals still have formaldehyde inside them as well. When the animals are cut open, our children are exposed to toxic poisonous ethylene glycol and formaldehyde.